I'm just wondering what editors you know which are "scriptable". E.g take an Emacs, one can really say you can do everything from within the editor: writing,reading, programming. All with the "scripting language" Emacs-Lisp. What other editors you know are out there as scriptable?
Do you know let's say an editor scriptable in Perl, Ruby or any other more C-like language?
Yi is the Haskell equivalent to Emacs. It is specifically designed along the same lines as Emacs: everything is scriptable in Haskell, the editor itself is more or less just a Haskell script, and there is only a very small, very generic, non-scriptable core. In contrast to most Emacs implementations, however, which use a different language for the core than for the scripts, Yi's core is also implemented in Haskell.
Redcar is a text editor written in (mostly) Ruby, which is fully scriptable in Ruby. It is not nearly as flexible as Emacs, but more on the level of TextMate.
On the Windows platform, the Zeus editor is scriptable in the Lua, Python, Java Script, VB Script and TCL languages.